Drill



Sgpt. 1941- c H. GARDNER, JR 2,255,561

DRILL Filed Jan. 15, 1940 EharZesE. Gard nan =77:

INVENTOR WITNESS ATTORNEYS Patented Sept. 9, 1941 UNITED STATES PATENT OFFICE Charles 11. Gardner, In, Pleasant Grove, Calif.

Application January 15, 1940, serial No. 314,002 Canada January 17, 1939 '1 Claims. (CI. 77-32),

My invention relates to drills, particularly of the portable type, and has among its objects and advantages the provision of novel means for applying pressure on the drill for advancing the bit into the work being drilled, with the pressure applying means so devised as to relieve the operator of the manual eflort necessary in connection with conventional portable drilling devices.

The present application is a continuation in part of my copending application, Serial No. 186,-

4'15, flled January 22, 1938, which has issued as Patent No. 2,198,208, dated Apr. 9,- 1940.

In the accompanying drawing:

Figure 1 is an elevational view oi a conventional portable drill showing my invention applied thereto;

Figure 2 is an enlarged sectional detail view of the pressure applying mechanism; and

Figure 3 is a sectional view of a control valve.

In the embodiment selected to illustrate my in- 40 and threadedly connect this cylinder with the plate at 50. Inside the cylinder 48 I slidably mount a piston 52 of the same general type as the piston 22, and between the piston 52 and the closure plug 54,1mount a compression spring 56 which tends to move the piston 52 downwardly.

The chamber 58 in the cylinder 42 is filled with a pression spring 10 which normally moves the vention, I make use of a conventional drill of the portable type, which drill includes a body or housing ll provided with a motor for driving the drill chuck I2. Such drills are well known in the art and need not be described in further detail.

Reierring to Fig. 2, a cylinder I4 has one end threadedly connected at I6 with a plate ll bolted at 20 to the body II. Inside the cylinder I471 slidably mount a piston 22 which includes an actuating rod 24 having a metallic disc 20 fixedly secured to its inner en Shaft 24 is preferably provided with a shank 28 disposed in a, bore 20 in the disc 28, and a dished element 32 is fixedly secured to the shank 20 by a bolt 34 so that the disc 20 will be held in place on theshank. Element 22 includes a flange 36 fitting snugly against the inner wall or the cylinder l4 to establish a seal; Element 22 may be somewhat flexible so that the flange 28 will be wall 01 the cylinder l4 as the piston 22 is moved downwardly.

Cylinder I4 includes a transverse wall 38 having a bore 40 for slidably receiving the rod 24,

and the rod extends through a packing gland 42, with the outer end of the rod provided with a head 44 adaptedto be positioned against an abutment for anpiyins drilling pressure to the drill or hit connected with the chuck I2. -With the head 44 positioned againstan abutment,-in-

. troduction of liquid under pressure into the chamber 40' in the cylinder i4 will urge the piston 1 22 upwardly which causes the head 44 to press against the abutment for exerting downward pressure on the drill bit.

Upon the plate It I mount a reservoir cylinder pressed against the inner plunger 64 to its outer extreme position.

Cylinder 62 includes a valve body I4 having ,a bore 18 provided with a valve seat 18 and a valve 20 arranged to permit liquid to flow from the chamber 82 of the cylinder 62, with the valve arranged to close to prevent the'entrance of liquid thereinto. Valve body I4 is provided with a tube 24 connected at 86 with the cylinder I4, which tube establishes communicationbetween the chambers 46 and 02. Valve body 14 is also provided with a valve seat 88 and a valve 00 arranged to admit liquid to the chamber 82 but operating to prevent outward flow oi the liquid. A tube 92 connects with the valve body 14 and the cylinder 48, as at 84. Thus the tube 82 establishes communication between the chambers 58 and 82.

interposed in the tubes 84 and 92 is a valve body Oihavinga rotatable plug 08 provided with bores I00 and I02. Plug 98 may be rotated through the medium of a wing I04. With the plug 00 positioned according to Fig. 3, here I00 aligns with the two sections of the tube 84 and the bore I02 aligns with the two sections of the tube 82. I

In operation, the chambers 46 and 58 are supplied with a suitable liquid and such liquid may;

be taken from the chamber 58 and delivered to plunger 64 for exerting drilling pressure on the piston 22. Spring 56 exerts a' constant pressure on the piston 52, which pressure is transmitted to the liquid in the chamber".- Thus the tube 82 is suppliedwith liquid at all times which permits the drill to be operated atdiflerent angles. Valves and constitute checks so that the liquid may be effectively transferred from' the chamber 50' to the chamber is, while liquid pumped into the chamber 46 is held therein by reason of the valve 80. Valve plug is posltioned according to the plunger 64. I

Rotation of the plug 98 through ninety degrees Fig. 3 duringoperatlon of from the positions of Figs. 2 and.3 brings the bores I00 and I02 to the dotted line positions of Fig. 3 so that the sections of the tubes 84 and 1 92 between the valve body 90 and the chambers the spring tension is such that a Sl ht down-u ward pressure on the head 44 will transfer liquid in the chamber 46- back to the chamber 58. Wing I04 is so arranged as to extend longitudinally oi the tubes 84 and 92 when the valve plug 98- is adjusted according to Fig. 3, so that the wingiacts as an indicator to determine the position of the valve plug.

"Having thus described certain embodiments of my invention in detail, it is, of course, understood that I do not desire to limit the scope thereof to the exact details's'et forth except insofar as.

those details may claims.

I claim: 1. In a drill of the type described, a drill pressure means, a pump controlled fluid circuit for operating said drill pressure means to apply pressure to the drill, and. a pressurereservoir for delivering fluid to said circuit. 2. In a drill of the type described, a drill pressure means, a fluid circuit for operating the drill pressure means to apply pressure to the drill, pump means in said fluid-circuit for placing the fluid acting on said drill pressure means under be defined in the appended drilling pressure, and a pressurereservoir for delivering fluid to said fluid circuit.

3. In a drill of the type described, a drill pressure means, a pump controlled fluid circuit for operating said drill pressure means to apply pressure to the drillja pressure reservoir for delivering fluid to said circuit, and a valve means for by-passing fluid acting on said drill pressure I means to said reservoir. 1

' 4. In a drill ofthe type described,'a drill pressure means, a fluid circuit for operating the drill liquid acting onsald drill drilling pressure.

pressure means to apply pressure to the drill, pump means in said. fluid circuit for placing the fluid acting on said drill pressure means under drilling pressure, a pressure reservoir for delivering fluid to said fluid circuit, and a valve means for by-passing fluid acting on said drill pressure means to said reservoir.

5. Ina drill of the type described, a first cylinder having a drill pressure means movably re-' lated thereto and arranged for engagement with a relatively fixed abutment to advance the drill, a liquid circuit for operating the drill pressure means to apply pressure to the drill, a second cylinder for a reservoir body of liquid connected into said liquid circuit, means for placing the liquid in said second cylinder under pressure for delivering the liquid to said liquid circuit, and pump means in said liquid circuit for placing the c. In a drill er the type described, a first cyllnder having a piston slidable therein, with the piston provided with a pressure element adapted to be placed in abutting engagement with a relatively fixed abutment to advance the drill, a second cylinder containing a supply of liquid, a

pump, a conduit between said second cylinder and said pump, a conduit between said first cylin-' der and said pump, valves in said conduitsfor controlling the flow of liquid from said second cylinder to said first cylinder, and a resiliently urged piston in said second cylinder for delivering liquid to the pump tobepumped to said first cylinder.-

V '7. In a drill of the-type described, a first cyiinder having a piston slidable therein, with the piston provided with a pressure'element adapted to be placed in abutting engagement with a rela tively fixed abutment to advance thev drill, a

second cylinder. containing a supply oI-liquid, a pump, a conduit between said second cylinder and said pump, a conduit between said first cylinder and said pump, valves in said condultsfor controlling the' flow of liquid from said second cylinder to said'first cylinder, a resiliently urgedpistocu in said second cylinder for delivering liquid to the pump to be pumped to said first cylinder, and valve means interposed in said con.-

duits for establishing direct communication between said first and second cylinders.

' CHARLES H. GARDNER,'JR.

pressure means under 

